Radeon HD 3650 vs Radeon HD 4650 1GB

Intro

Compare that to the Radeon HD 4650 1GB, which features clock speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon HD 3650		78 Watts
	Difference: 23 Watts (42%)

Memory Bandwidth

In theory, the Radeon HD 3650 should be a little bit faster than the Radeon HD 4650 1GB in general. (explain)

Radeon HD 3650		25600 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 3200 (14%)

Texel Rate

The Radeon HD 4650 1GB will be much (approximately 231%) more effective at AF than the Radeon HD 3650. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 13400 (231%)

Pixel Rate

The Radeon HD 4650 1GB should be a lot (more or less 66%) more effective at full screen anti-aliasing than the Radeon HD 3650, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 1900 (66%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.